224 MELANIIDJl. 



One or two exactly resemble M. Brot's pi. 21, tig. 5 — long. 31|, 

 diam. 11 mil.; the others have the last whorl more contracted, 

 evenly rounded, instead of slightly siibangulate — long. 31 A, 

 diam. 10 mil. The largest long. 39i, diam. 12f mil. They 

 are all of a plain, uniform coloration, without any traces 

 either of spots or bands. 



subvar. cochlidium. 



Mehn'm cachlidmm, Lea, P. Zool, S. 1S50, Siquijor and Guimaras ; Heeve, 

 fig. 27. 



3 Katchall ; coll. F. A. de RoepstorfF, Esq. 



The infra-sutural ledge is less marked than in the above- 

 quoted figm'es, but still quite distinct, especially near the aper- 

 ture. 



var. pirenoidea, nov. 

 2 [Camorta ? Nicobars] ; coll.F. A.de Roepstorff, Esq. 



A remarkable, " Pirena-like," strongly decollate and raassive 

 form, perhaps the origin of the observation in the voyage of the 

 " Novara " of the finding of a species of Pirena at Katchall ? 



One specimen of 4 whorls measures long. 30, diam. 12 mil., 

 and is well represented by M. Brot's pi. 21, fig. 16a, the apical 

 whorls of course being left out of consideration ; the other of 

 3 whorls, and the internal portion of a fourth has the last 

 whorl more convex, with a slight infra-sutural shelf ; long. 30, 

 diam. 13 mil. M. Brot's pi. 21, fig. 16, though smaller and with 

 the last whorl more cylindi'ical, gives a veiy fair idea of it ; 

 both are of uniform coloration. 



2 Camorta ? ; coll. F. A. de Roepstorff, Esq. 



One is a quite young specimen of 7 whorls, slightly decollats, 

 as in Brot's pi. 21, tig. 17; the other of medium gi'owth, has 

 5 whorls remaining, none of which show the apical sculpture 

 as does the preceding. I have little hesitation in X'ef erring both 

 of them to this variety as non-adult forms. 



subvar. perdecoUata. 



2 Nicobars ; coll. F. A. de Roepstorff, Esq. 



